Steel Structures design 4

 61.For rivet diameters upto 24 mm, the diameter of rivet hole is larger than the diameter of rivet by ?

• 1 mm 
• 1.5 mm 
• 2 mm 
• 2.5 mm 

62.The single channel sections, used as tension member, have ?

• low rigidity in the direction of web and high rigidity in the direction of flange 
• nigh rigidity in the direction of web and low rigidity in the direction of flange 
• equal rigidity in the direction of web and flange 
• none of the above 

63.In order to determine the gross-sectional area of a tension member consisting of two laced channels, the allowance for holes is made as ?

• two holes from each flange 
• two holes from each web 
• two holes from each channel web or one hole from each flange, whichever is more 
• none of the above 

64.Which of the following is a best compression member section ?

• Single angle section 
• Double angle section 
• I-section 
• Tubular section 

65.A single angle steel tie is connected to gusset plates at both ends using rivets. For determining e load carrying capacity of the tie, the allowable tensile stress should be multiplied by the ?

• gross area of the angle 
• net area of the angle 
• net area of the connected leg plus the effective area of the outstanding leg 
• effective area of the connected leg plus the gross area of the outstanding leg 

66.A piece of round steel forged in place to connect two or more steel members is known as a ?

• bolt 
• rivet 
• screw 
• stud 

67.Bending stress may develop in the case of ?

• lap joints 
• single cover butt joints 
• double cover butt joints 
• all of these 

68.The net area of a round bar which resists the tension is the area of cross-section at the ?

• root of the thread 
• crest of the thread 
• mid-section of the thread 
• none of these 

69.The efficiency of a riveted joint is equal to ?

• Least strength of riveted joint / Strength of solid plate 
• Greatest strength of riveted joint / Strength of solid plate 
• Least strength of solid plate / Least strength of riveted joint 
• Least strength of solid plate / Greatest strength of riveted joint 

70.In case where cover plates are used, tacking rivets are provided at a pitch in line not exceeding ........ times the thickness of outside plate or 300 mm whichever is less ?

• 8 
• 16 
• 32 
• 64.

71.The effective throat thickness in case of incomplete penetration butt weld is taken as ?

• 7/8th of the thickness of the thicker part joined 
• 7/8th of the thickness of the thinner part joined 
• 5/7th of the thickness of the thicker part joined 
• 5/7th of the thickness of the thinner part joined 

72.Rankine-Gordon formula for buckling load is adopted for columns having slenderness ratio ?

• more than 120 
• less than 120 
• more than 120 and less than 200 
• none of these 

73.Allowable working stress for struts may be assumed as ?

• 60 N/mm² 
• 80 N/mm² 
• 100 N/mm² 
• 120 N/mm² 

74.Tacking rivets in compression members are used, if the maximum distances between centres of two adjacent rivets exceeds ?

• 12 t or 200 mm whichever is less 
• 16 t or 200 mm whichever is less 
• 24 t or 300 mm whichever is less 
• 32 t or 300 mm whichever is less 

75.Intermediate butt welds are used to resist ?

• shear stresses 
• dynamic stresses 
• alternate stresses 
• all of these 

76.In position restraint condition of column ?

• end of the column is free to change its position 
• rotation about the end of column cannot take place 
• end of column is not free to change its position 
• rotation about the end of column can take place 

77.An eccentrically loaded column is subjected to ?

• bending stress design of an eccentrically loaded 
• direct stress 
• shear stress 
• both (a) and (b) 

78.The weakest plane in a fillet weld is ?

• a side parallel to the force 
• a side normal to the force 
• along the throat 
• normal to the throat 

79.In the roof trusses, the horizontal beams spanning between the two adjacent trusses are known as ?

• spandrel beams 
• rafters 
• purlins 
• all of these 

80.The large deflections in beam ?

• may result in cracking of ceiling plaster 
• indicate the lack of rigidity 
• may cause the distortions in the connections 
• all of the above.